Cal and Ami broke up because Cal wanted to join the rebels and for Ami to come with him, I'm not sure how the break up went exactly yet so I can't exactly say for sure how Ami would've reacted but this definitely sounds fun so far lol

So then when you and the person who plays Cal (my brain doesn't work sorry XD) figure it out, we can go from there about how it went with Ami and Sam?

Cal was like "I know the truth" and his just ghosted the poor boi XD Grey probably wouldn't associate with any of her family either and all NPCs are playable to everyone just stay to their personalities.

Cal; Tries to convince Ami to join the rebels with him

Ami; Has morals

Cal; Ghosts boyfriend and joins rebels

XD Basically how it went, right?

Yes. Very much so XD

So depending on how Ami dealt with Cal ghosting him, he might try to get Sam away from Jerr and say she should leave? Since Ami has morals maybe he wouldn't directly say join the rebels XD

So with the riders related to me, I need to plead with Wander to let Ellie and Ticali to be paired, or Lunar Frost gets Ellie and Ticali is all on her lonesome

I feel like for a bit Ami would be super optimistic that Cal's gonna come back and then after he realizes he's not then he's gonna be extremely heartbroken and clingy to literally anyone who'll let him cling to them. So if she tells him immediately, then it probably won't be that bad- Just a, 'Huh. Is that why you aren't hanging out with me as much? Well- I'm happy for you but also, uh, Jerr's a commander. Not too sure if that's allowed... Hm... If you need my help setting up date nights, let me know- Oh! Also! If you see Cal, let me know- If haven't seen him since... Uh.. Since. You know? I wanna check up on him, make sure he's alright.'

Well Sam wouldn't tell him right away XD
Even to people she likes and is close to she needs time to digest stuff before she talks

How long after then? Since I'm thinking Ami would probably have like, a week or so of optimism before becoming heartbroken. And then another week or so before he gets to the point where he gets very jealous of them people again